package chapter05.example09;

public class example09 {
    private  static final  int TIMES = 100000;
    public static void main(String[] args) {
        example09.testString();
        example09.testStringBuffer();
        example09.testStringBuilder();
    }
    public static void testString(){
        long startTime = System.currentTimeMillis();
        String str = "";
        for (int i = 0; i < TIMES; i++) {
            str += "test";
        }
        long endTime = System.currentTimeMillis();
        System.out.println("String test usedtime:"+(endTime - startTime));
    }
    public  static  void  testStringBuffer(){
        long startTime = System.currentTimeMillis();
        StringBuffer str = new StringBuffer();
        for (int i = 0; i < TIMES; i++) {
            str.append("test") ;
        }
        long endTime = System.currentTimeMillis();
        System.out.println("StringBuffer test usedtime:"+(endTime - startTime));
    }
    public  static  void  testStringBuilder(){
        long startTime = System.currentTimeMillis();
        StringBuilder str = new StringBuilder();
        for (int i = 0; i < TIMES; i++) {
            str.append("test") ;
        }
        long endTime = System.currentTimeMillis();
        System.out.println("testStringBuilder test usedtime:"+(endTime - startTime));
    }
}
